[SNMP4J] v3 NPE

[Zhan Yi]

Hi Frank,

In real situation I do use the snmp class. How ever I can't figure out how to seperate the parameters. Would you please give some code example? 

Best Regards
Zhan Yi

----- Original Message ----- 
From: "Frank Fock" <fock at agentpp.com>
To: "Zhan Yi" <zhanyi at vanlink.com.cn>
Cc: <snmp4j at agentpp.org>
Sent: Tuesday, June 08, 2004 2:55 PM
Subject: Re: [SNMP4J] v3 NPE


> Hi Zhan,
> 
> Caution! The SnmpRequest class is *not* designed to be used by
> multiple threads concurrently! The SnmpRequest class is an example
> implementation and must not be used to these kind of tests.
> 
> By using it in your way it will produce trash because the parameters
> from the two threads will get mixed inside the SnmpRequest class!
> 
> Please use the Snmp class to implement your SNMP requests.
> 
> Best regards,
> Frank
> 
> Zhan Yi wrote:
> 
> >Hi Frank,
> >
> >Below is the sample code that will reproduce the problem. 
> >I have no way to solve this problem, can you give some advice.
> >
> >Best Regards
> >Zhan Yi
> >
> >public class TestSnmp4J {
> >    
> >    public static void main(String [] args) throws Exception {
> >        String [] params1={"-t", "5000", "-u","cisco","-a","MD5","-A","auth","-x","DES","-X","priv","-Ow","13.253.253.253/161", "1.3.6.1.2.1"};
> >        walkThread(params1);
> >        String [] params2={"-t", "5000", "-u","peter","-a","MD5","-A","12345678","-x","DES","-X","12345678", "-Ow", "13.100.200.39/161", "1.3.6.1.2.1"};
> >        walkThread(params2);
> >    }
> >    
> >    static void walkThread(final String [] params) {
> >        new Thread(new Runnable() {
> >            public void run() {
> >                try {
> >                    org.snmp4j.tools.console.SnmpRequest.main(params);
> >                }catch(Exception ex) {
> >                    ex.printStackTrace();
> >                }
> >            }
> >        }).start();
> >    }
> >
> >
> >----- Original Message ----- 
> >From: "Frank Fock" <fock at agentpp.com>
> >To: "Zhan Yi" <zhanyi at vanlink.com.cn>
> >Cc: <snmp4j at agentpp.org>
> >Sent: Tuesday, June 08, 2004 3:02 AM
> >Subject: Re: [SNMP4J] v3 NPE
> >
> >
> >  
> >
> >>Hi Zhan,
> >>
> >>This error occurs when the USM returns an error while preparing
> >>the outgoing message (most likely because the user is not known
> >>to the USM which is referenced by the scoped PDU). That the NPE
> >>is thrown is a bug, although it should not happen in a properly
> >>setup application. The next SNMP4J version will throw a
> >>MessageException here instead a NPE.
> >>
> >>Best regards,
> >>Frank
> >>
> >>Zhan Yi wrote:
> >>
> >>    
> >>
> >>>Hi,
> >>>
> >>>I got NPE occasionally using snmp v3 and running multiple concurrent threads.
> >>>Can you give some hint on how to understand and solve this problem? Using v1 there is no problem.
> >>>
> >>>java.lang.NullPointerException
> >>>       at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:330)
> >>>       at org.snmp4j.Snmp.send(Snmp.java:285)
> >>>       at org.snmp4j.Snmp$PendingRequest.run(Snmp.java:661)
> >>>       at java.util.TimerThread.mainLoop(Timer.java:432)
> >>>       at java.util.TimerThread.run(Timer.java:382)
> >>>
> >>>Thank you!
> >>>
> >>>
> >>>Best Regards
> >>>Zhan Yi
> >>> 
> >>>
> >>>------------------------------------------------------------------------
> >>>
> >>>_______________________________________________
> >>>SNMP4J mailing list
> >>>SNMP4J at agentpp.org
> >>>http://p15141779.pureserver.info/mailman/listinfo/snmp4j
> >>> 
> >>>
> >>>      
> >>>
> >>
> >>    
> >>
> 
> 
>